Device for removing and conveying injection-molded piece

Abstract

A transparent thin bottle-shaped container is produced by means of a technology for biaxial orientation blow molding a cylindrical piece with a bottom from polyethylene terephthalate material. The pieces are molded in large number in each injection molding process of an injection molding machine. The pieces thus formed immediately after the injection molding are held simultaneously in large number at the gates integrally projected therefrom by a base plate moved forward at the front of the mold in the injection molding machine. They are then conveyed to a gate cutting unit provided near the injection molding machine. The gates are cut from the pieces sequentially by the gate cutting unit and are conveyed onto a conveyor. The pieces are gradually cooled from the hot molded temperature during the conveyance and are additionally cooled while being conveyed on an oblique conveyor installed with a cooler to room temperature or lower predetermined temperature. The cooled pieces are then supplied to a heater immediately before entering a biaxial orientation blow molding process.

What is claimed is: 
     
       1. A device for cooling and conveying hot preforms for bottle-shaped containers of polyethylene terephthalate resin immediately after formation by injection molding, said device comprising: an endless belt conveyor for continuously conveying preforms resting on an outer surface thereof;   a cover substantially enclosing said endless belt conveyor;   a cooling air inlet provided in said cover for introducing cooling air to cool the hot preforms on said conveyor to a predetermined temperature; and   a scattering plate between said inlet and said conveyor perforated with a number of vent holes for distributing the cooling air to a predetermined space between sid cover and said conveyor, wherein said vent holes are distributed on said scattering plate such that substantially none are disposed adjacent said cooling air inlet.   
     
     
       2. A device according to claim 1, wherein said conveyor and said cover are upwardly inclined from a rear portion to a forward portion. 
     
     
       3. A device according to claim 1, said device being adapted to prevent abrupt cooling of said preforms and to ensure cooling to a uniform predetermined temperature from which said preforms may be heated for biaxial orientation. 
     
     
       4. A device according to claim 1, wherein said endless belt conveyor further comprises lateral projection straps formed on an outer surface thereof at substantially equal intervals to aid in conveying said preforms.